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瞬时水分利用效率以敖汉苜蓿最高。
WUE of Aohan alfalfa was the highest in all alfalfa varieties.
冬小麦瞬时水分利用效率与饱和差呈极显著负相关，达到0.01显著水平。
Negative correlation between Instantaneous WUE and saturation deficit was significant at 0.01 level.
结果表明，分根交替灌溉可增强烟株的根系活力，保持较高的光合速率，降低蒸腾速率，提高叶片瞬时水分利用效率；
The results indicated that root-divided alternative irrigation could increase root activities, photosynthesis rate and water use efficiency of tobacco leaf, but decrease transpiration rate;
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